Axelander

No, if you want to use high f-numbers (so, small apertures) like for example f1:16 because it is very bright outside. No problems at wide apertures (eg. 1:2.8) Watch the video and you will see

Make yourself familiar with the risks of upgrading the firmware to 3.0 before doing so ("hunting focus", for f opened less than ~ 1:8) e.g. https://www.youtube.com/watch?v=Wa7-S8bsXjk aaand this thread: https://www.fuji-x-forum.com/topic/7879-x-t3-focus-hunting/

Not sure if this is it, but is the sports finder mode turned off? In "Shooting setting" 1/2 (Camera symbol) Also, you can choose a 1,25x crop for low speeds (which is forced for 30fps) in Drive setting (also shooting setting)